Standing desk



FIG. 1 is a front top perspective view of a standing desk, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a front view of a standing desk shown in a collapsed position; and,

FIG. 9 is a front view of a standing desk shown in a fully extended position.

The broken line portion of the figure drawings is included to show portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a standing desk, as shown and described. 